From 5dcee558b61f0f5dd70e18a530a2bb97c479aab5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Sun, 4 Sep 2011 07:58:30 +0200 Subject: Pre-build the tuples returned by os:type/0 and os:version/0 Pre-building the tuples returned by os:type/0 (system_info(os_type)) and os:version() (system_info(os_version)) saves some run-time and avoids building garbage in the calling process. --- erts/emulator/beam/erl_bif_info.c | 48 +++++++++++++++++++++++---------------- 1 file changed, 28 insertions(+), 20 deletions(-) (limited to 'erts/emulator/beam') diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c index e17325b64f..de5e4046fa 100644 --- a/erts/emulator/beam/erl_bif_info.c +++ b/erts/emulator/beam/erl_bif_info.c @@ -119,6 +119,10 @@ static char erts_system_version[] = ("Erlang " ERLANG_OTP_RELEASE # define PERFMON_GETPCR _IOR('P', 2, unsigned long long) #endif +/* Cached, pre-built {OsType,OsFlavor} and {Major,Minor,Build} tuples */ +static Eterm os_type_tuple; +static Eterm os_version_tuple; + static Eterm current_function(Process* p, Process* rp, Eterm** hpp, int full_info); static Eterm current_stacktrace(Process* p, Process* rp, Eterm** hpp); @@ -2227,16 +2231,7 @@ BIF_RETTYPE system_info_1(BIF_ALIST_1) return erts_instr_get_type_info(BIF_P); } else if (BIF_ARG_1 == am_os_type) { - Eterm type = am_atom_put(os_type, strlen(os_type)); - Eterm flav, tup; - char *buf = erts_alloc(ERTS_ALC_T_TMP, 1024); /* More than enough */ - - os_flavor(buf, 1024); - flav = am_atom_put(buf, strlen(buf)); - hp = HAlloc(BIF_P, 3); - tup = TUPLE2(hp, type, flav); - erts_free(ERTS_ALC_T_TMP, (void *) buf); - BIF_RET(tup); + BIF_RET(os_type_tuple); } else if (BIF_ARG_1 == am_allocator) { BIF_RET(erts_allocator_options((void *) BIF_P)); @@ -2262,16 +2257,7 @@ BIF_RETTYPE system_info_1(BIF_ALIST_1) BIF_RET(am_false); } else if (BIF_ARG_1 == am_os_version) { - int major, minor, build; - Eterm tup; - - os_version(&major, &minor, &build); - hp = HAlloc(BIF_P, 4); - tup = TUPLE3(hp, - make_small(major), - make_small(minor), - make_small(build)); - BIF_RET(tup); + BIF_RET(os_version_tuple); } else if (BIF_ARG_1 == am_version) { int n = strlen(ERLANG_VERSION); @@ -4107,6 +4093,27 @@ BIF_RETTYPE erts_debug_lock_counters_1(BIF_ALIST_1) BIF_ERROR(BIF_P, BADARG); } +static void os_info_init(void) +{ + Eterm type = am_atom_put(os_type, strlen(os_type)); + Eterm flav; + int major, minor, build; + char* buf = erts_alloc(ERTS_ALC_T_TMP, 1024); /* More than enough */ + Eterm* hp; + + os_flavor(buf, 1024); + flav = am_atom_put(buf, strlen(buf)); + erts_free(ERTS_ALC_T_TMP, (void *) buf); + hp = erts_alloc(ERTS_ALC_T_LL_TEMP_TERM, (3+4)*sizeof(Eterm)); + os_type_tuple = TUPLE2(hp, type, flav); + hp += 3; + os_version(&major, &minor, &build); + os_version_tuple = TUPLE3(hp, + make_small(major), + make_small(minor), + make_small(build)); +} + void erts_bif_info_init(void) { @@ -4114,4 +4121,5 @@ erts_bif_info_init(void) erts_smp_atomic_init_nob(&hipe_test_reschedule_flag, 0); process_info_init(); + os_info_init(); } -- cgit v1.2.3